Astronomers have revealed new evidence that there are not just one but four tiny planets circling around Barnard's Star, the second-nearest star system to Earth.

Harvard astronomers have announced the discovery of over 100 previously undiscovered moons orbiting the planet Saturn.

Here's what to know about the short life of what was, for a single human lifetime, the solar system's smallest planet. Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer at the ...

Pluto, discovered in 1930, was once considered the ninth planet in our solar system. In 2006, the International Astronomical Union reclassified Pluto as a dwarf planet because it doesn't meet all ...

IT'S been nearly 40 years since the first planet outside of our Solar System was discovered. Since then, more than 5,800 weird and wonderful worlds across 4,300 planetary systems have been located.

the most recently discovered planets in the solar system at the time, seemed out of sorts. Their orbits didn't add up mathematically, and Lowell was convinced there was an undiscovered planet in ...

The fastest ever winds discovered in our own Solar System occur on Neptune - only reaching as much as 1,200mph. This hellish planet is infamous for two reasons: its deadly weather and its smell.